[Gasification] Sawdust in Fan TLUD

Art Krenzel phoenix98604 at msn.com
Sat Jun 4 16:39:42 CDT 2011


Rolf,
 
I do not know why other machines like it were never made.  That was the only machine of that design I have ever seen.  I think the quality of the end product pellets did not make it through the long distance, multiple handling systems sufficiently well to meet the needs of the end user.  They were sort of "heavily squished" rather than extruded with a melted lignin total outer coat.  This left the pellet much more susceptible to handling damage.  The process was operated in full recycle mode until the gears heated up before any product was made to facilitate the heat pressing of the sawdust.
 
I would seriously review using a hollow cylinder with a piston to compress the sawdust.  It does not do well in the "rock in the sawdust" test.  Most, if not all, pelletizing processes need alot of cleanup of the floor area with brooms and shovels used by minimum wage help.  This swept up material is normally added to the feed side of the system and could cause serious maintenance difficulties.  The gears were spring loaded and just bounced open sufficiently to pass any incompressible foreign matter.
 
The gear pelletizer system was incredibly quiet.  The loudest noise came from the auger and the loader (when it was running).

Art 

 
> From: energiesnaturals at gmx.de
> To: gasification at lists.bioenergylists.org
> Date: Sun, 5 Jun 2011 00:16:15 +0200
> Subject: Re: [Gasification] Sawdust in Fan TLUD
> 
> Art, 
> this sounds very close to what I want to do and I cannot find it done!
> 
> I want to make pellets without having to pelletize.
> After my very good experience with almond shells ( m/l 30 x 20 mm) passing 
> readily through 3 and 3.5 " (75 and 90 mm) spiral augers and around bends,
> I want to stamp wood chips on a rotating cilindrical die into " coins" of 
> some 15 -20 mm diam.
> I imagine some kind of hollow cylinder with holes and a matching, synchronized 
> cylinder with short hardened steel punches stamping the chips thru those holes 
> .
> The stamped chips fall out of the hollow die and what has not been stamped 
> runs around for another chance... 
> 
> Why does this machine not exist ?
> 
> Rolf
> 
> 
> 
> 
> Am Samstag, 4. Juni 2011 21:19:26 schrieb Art Krenzel:
> > Pete,
> > 
> > Have you looked into gear compression pelletizer? Several years ago at the
> > Port of the Tri Cities in Oregon, I saw a sawdust pelletizer made of two
> > large gear wheels (about 18 inches in diameter) which were heavily spring
> > loaded together and driven by a highly geared down electric motor. I
> > believe only one gear wheel was driven with the other acting as an idler. 
> > They acted as a "nip roller" in the real world. They formed a semi solid
> > pellet about two inches long and about 5/8 inch in diameter.
> > 
> > Sawdust was augured to a hopper above where the gear wheels meshed and self
> > fed into the gears. The gear faces measured approximately two inches
> > wide.
> > 
> > The pellets were not of the same high density as the extruder pelletizers
> > make but if your purpose is only to use the straw on site, this might work
> > for you. They were handling the pellets with a bucket loader and auger. 
> > Some of the pellets broke down in handling but the bulk of them remained
> > in good shape.
> > 
> > It was simple, quiet and did not have a very large electric motor driving
> > it.
> > 
> > Art Krenzel
> > 
> > > -----Original Message-----
> > > From: gasification-bounces at lists.bioenergylists.org
> > > [mailto:gasification-bounces at lists.bioenergylists.org] On Behalf Of Pete
> > > & Sheri
> > > Sent: Friday, June 03, 2011 9:01 AM
> > > To: 'Discussion of biomass pyrolysis and gasification'; 'Thomas Reed'
> > > Cc: 'Hugh McLaughlin'
> > > Subject: Re: [Gasification] Sawdust in Fan TLUD
> > >
> > > Could one possibly semi-pelletize the sawdust directly at the input to
> > > the gasifier? I see pellet makers that use a screw extrusion method. If
> > > one could get enough compaction to loosely hold the particles together,
> > > right at the input point, then there wouldn't be the "spouting" discussed
> > > previously. There also wouldn't be all that pressurized air to deal with.
> > > The compacted material would also create a "seal" between the gasifier
> > > and the outside world, if needed.
> > >
> > > Pete Stanaitis
> > > --------------
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Gasification mailing list
> > >
> > > to Send a Message to the list, use the email address
> > > Gasification at bioenergylists.org
> > >
> > > to UNSUBSCRIBE or Change your List Settings use the web page
> > > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioen
> > >erg ylists.org
> > >
> > > for more Gasifiers, News and Information see our web site:
> > > http://gasifiers.bioenergylists.org/
> > >
> > >
> > >
> > > _______________________________________________
> > > Gasification mailing list
> > >
> > > to Send a Message to the list, use the email address
> > > Gasification at bioenergylists.org
> > >
> > > to UNSUBSCRIBE or Change your List Settings use the web page
> > > http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioen
> > >ergylists.org
> > >
> > > for more Gasifiers, News and Information see our web site:
> > > http://gasifiers.bioenergylists.org/
> > 
> 
> _______________________________________________
> Gasification mailing list
> 
> to Send a Message to the list, use the email address
> Gasification at bioenergylists.org
> 
> to UNSUBSCRIBE or Change your List Settings use the web page
> http://lists.bioenergylists.org/mailman/listinfo/gasification_lists.bioenergylists.org
> 
> for more Gasifiers, News and Information see our web site:
> http://gasifiers.bioenergylists.org/
 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/gasification_lists.bioenergylists.org/attachments/20110604/688aa77b/attachment.html>


More information about the Gasification mailing list